Note: "file.iso" is not the exact thing that you type in, it is whatever the iso's name is

Remember that when you are finished you should unmount the ISO file by typing the following code into the terminal

sudo umount /media/iso/

Last but not least, most likely you would like to burn the ISO onto a CD/DVD which is the easiest part, since it does not require the terminal. First Insert a blank CD/DVD into your CD/DVD burner next locate where the ISO file is located then:
Right click on Image (ISO) file -> Write to Disc... -> Write